<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="13.css">

</head>

<body>
    <div class="a">
        <div class="b" style="left:-100px">
            <div class="c" style="background-color: yellow;"></div>
            <div class="c" style="background-color: orange;"></div>
            <div class="c" style="background-color: greenyellow;"></div>
        </div>
    </div>
</body>

</html>
<script src="13.js"></script>